The diagram illustrates the process of development of camera since its invention in 1839. Overall, there are 4 stages in total, starting from cubic wodden box of 36cm in which the hollow is made up of brass and later emerging as a modernized camera made up of metal, whose length was 14 cm.
In 1839, the camera was basically Daguerrotype, built from wodden of 36cm length, is composed of brass to capture the photo. After 49 years, kodak no.1 designed , where wodden was completely replaced by metal and the length reduced to 16cm. In 1925, Leica 1 was built, which design was completely different than the previous ones, and its distance reduced by 2 cm.
However, in 2000, digital camera rised, which was basically made from plastic and it consisted zoom lens, LCD screen and can be connected to internet. Also, the length was again reduced to thrice of the wodden one.